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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3db8c7c5f1f302c72037f8071a23a00a48376e7efb84a51366a1ccf7668865' 
  AND token = 'W2nSzmZ9JI9UZtLeVpvWu489fKYcegcUqCiHVEvLgEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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