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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad465a38f8fcc59bf986e3625a8db1a8f78425f1fe4874a904e2cfade664cf7c' 
  AND token = 'EdranLf3iiW6rzn8l3THIaOfbI7xZO8gNIZAliizW3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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