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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b2ea978b33cf51bd08d18df7ac0c6a739be2dde9ddcbd532accc96a69aaf12' 
  AND token = 'D99QjTCgyLCSyTIPIXprJVce7TFMqylqSa11qM531DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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