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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe9df08ddbc5d445187b96338d714af1d2c3fdec4f1f526e41ae85e8290fed7' 
  AND token = 'QFlIBLGokLRk6wp1snQ7hMw02BvcN52hRTUz0doJepI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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