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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1207965993c740eafe6f1802762931d7edfef8cd20e815900ca50de67c52684' 
  AND token = 'ByUVbeAnPTxD9DX5sqSiVvKUrWHKIbu7qcrgydEhb74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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