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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e55560b606c191b4ab51cbdc045a231a7540e0490b7422724c953243559d2a' 
  AND token = 'bfeNTvdHTvNaX4uReiPN6cW01p/OgThYi8HFeCTASiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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