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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb70e07fc5b1a6ddfb71edbbe214e08030927bf58c9c46e5b6fa60944ab663fc' 
  AND token = 'dO1YSBkE+Z8zastjDe7Gyw6ZqNwU24gpGSkf5acTEQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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