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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9defd2c49ab83c2d2b6137dc1828a860001763857b3e22e6bb072b54ddc6b681' 
  AND token = 'vKcQr7UYUYsGMyxFJxKmIYcWrgvUxtxD2s2NoWkX76k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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