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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb99fb23a12cdcf81d037f0689314f0ee108d1712d90d672f917ff6055ca2cc6' 
  AND token = 'BcpJ7u2NyOBnmgLjubotQ56jc4N7Q/U/EnSdqwvj5OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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