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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573fbf39e7845e5bd8966466fae67f2883348085f75f5695c737e9e08b291bd9' 
  AND token = 'YfkiCj646SqNIzi/X3zwGybHk4y/xofvdG3TJWy5HOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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