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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f5f2369c051faa0c35ac4744478aa5ea57757b3a6c0e7851512ba41988de14' 
  AND token = 'W6WKFDXJZEWKID6GnL6eTgGkSOjoaULt5GCpeXiFHR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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