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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf8cfa7d77b20d02cd6be3656b1f096898ead49d3a529af31b9bc28e3fa768b' 
  AND token = 's6ciTb2xAvCkHkQKcKvd0h1scI9kckLeUDXgMFOG8HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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