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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228aaf3f1c599887ed0b187e647bffae053d9b2ef9bced797677e14891bd44d1' 
  AND token = 'ZXyCvJ951FUn9u4ciWjFPqxWlpvtwBZPcJWU2B6Zu1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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