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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224846bddb9f9231787690cb96fd841842a76daf0e57d67016999ea107a8fe17' 
  AND token = 'cljrBddrFiP6V87/NY5cUGTiRpjJoAMGnt14ZAfoauo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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