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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f3e1fc8247eea26e82296f084a6a503b78083744694fb79d1ca9bcabcff345' 
  AND token = 'pIj6AL/g9zjNZF5KmOfJkEKXfb5lKf5a4os90I73Rfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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