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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a876ea52fb4e298437a2e465d35614fc72e57f84e6c7fefce36787edbd4833' 
  AND token = '70rX1E3T+OItWDPPmHf99Dow3IApISoAPz+tOQhOXkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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