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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e768f9a97b407bb2fd058e5cb975afa5758cb40542dbf444cc46b494525f70d2' 
  AND token = 'LS2IRSBewDALHQqbZihhoqh9hkI56NSACmF0lyKY1tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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