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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6253b7653838f35848ee132a37d9947e344f80ea3269f2cac4258d2e3c9208b3' 
  AND token = '+L1/9biECbuSSeI2Ll++8Ac/Q7J/wDkjKtUuKot4RXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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