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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa00eb9fadb2ccfc9f9bea9bfec2105a2eafa7a4d7d462654b0506ab5c900870' 
  AND token = 'PacSA6TcaXycE5Tb6kc0pDXE9u3GPC7vlgqXvtTLEpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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