SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8068cd2b11f92970ee6f28b3973f1b7c6004a17b55eea84c33a95cf66d35fd' 
  AND token = 'q/zMlAFhAlwWMZ8aYmVjZmZy81xKX6wuPJLa20PIeFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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