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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e450a39098fb4ca5d73773ae85c34fb3aa289b43368ad2a308086480b78a4160' 
  AND token = 'BaQXJBNL6c49FKf5t/Z998VhQhRZk1vEr7M4SgjglGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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