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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe21825fc506da109dd6f4cbb60df14b79c256cb02f319233a036c7875e41d2' 
  AND token = 'sHRj0bcmGOcGjojZ/IqccHBj+33uDViE0bmvuKQji0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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