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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9638474b07a2a7ac4af51b616557f795efbd86adf8bdcf2a5dbbd3ebdbd781e8' 
  AND token = 'IaJzl4FXY4Uxysdik99ldpZadVVNl12JmBKA2n2rgvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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