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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acadcfb7dae9872ddbd4cc5ff30dd837841e4a777e2771838f0813d0c6843c7c' 
  AND token = 'VkKdRw/fbhVz85+lIV3ln9oiCL5S5+cSAd2TykuH/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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