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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714d6be0013c95cd8571ec0a06f0b169651b95b722b6f94d18a69ac6c1dc688c' 
  AND token = 'WO3Zvh/onPYW326pdSkYHHCaiNnvw2Rhx8VE4PfQFes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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