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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57e6a138a66f8ed6bd92aa6831d3c88538ad6bfbdc31210f6c02b43c02ea60' 
  AND token = 'jaS8SH4EtOxOyMAc7LpYYv1t8cpygHAX6uDRTTc50sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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