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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8965efc6915c98be18e525bba4230619d2ab0c4c8e228236f5c350150fe6899' 
  AND token = 'EqUEPmiwSzkLeJptbUIiBu43njbPcPGPNc/b0sTLcPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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