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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0796b3426773b14fe6a68cdc110578dc9ee21e5a5a22ae74d51c0c38de12e16b' 
  AND token = 'm3oUDCDGXQXIe2yj8258+zD9q0H57t2ndAclwAYkYSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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