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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faeb1ac01a4e917882245ac84862e3feab919a474a07bfb4876f860ab8f5c37' 
  AND token = 'M+NFc3RoWYu5KjMyPe7xKArj9HNTZGC40K4v1ROFznU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}