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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac792265a6c651e7b9401b2337126e4eed925913568f0c9ab8721a8c6808f3c3' 
  AND token = 'edQV+wguifnK4SmnyyWfh8S8VE5n9u8sKTNGET74Nq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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