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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3443c6ba38831b58a448eb4040d706c3f18ec6d12669103b55c51ba65d6eed9' 
  AND token = 'xZPd6cWvPPKDLFpfjEiySAjO9Gw7t0tSZ5echdL7B8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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