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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fa5c6d1b5175047ef6e787dc66a6217f354212269e70294ca45a29ae891bc7' 
  AND token = 'ZULCQ5X9FdF3SOAS/d+wptb8JV4rrzMmIC4p5Ul6keA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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