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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac130e51323358d8c5fead6517fe92d8ee55d8e092689ac2e7f913562d93e9a' 
  AND token = '3XHeea4aLxx/Q6lQgMilrcsoxGq7xXaA9aPgokujJBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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