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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd67700513ae9edf94f9a481b83e41ef67f5d25bf40b8f0cbc31c45a3101bd4' 
  AND token = 'l9SggIye4LqoyZS3U28ahm/Y/3I4VKs0RSJVsiFTmqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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