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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a101d00af7d14de5aac2f99bbd11f3383de99386f0198afc5c9807b121e09a9e' 
  AND token = 'nU8xFUX1L7owF7ZiQqqH5Un+2B3s3MiZEKIDNI16tU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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