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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4fd4a99373575168960b16b0cdcf8b7cda35007851a6344bdde7276f68fc6e' 
  AND token = 'SGqvxnBYl4Q34HtRl/AGx9KmSHWJ60xy/2P6P2yxz7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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