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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cae5ad989589bf3490e0954d158b759b5fd5a3f6f66499e862d7fc8aedb6257' 
  AND token = '+7gfJgpeTexqxPzWOxgZFWi5BL30yajbAjG6/iKoHP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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