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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc96101d56614ec3038cef81a27fe5d6fb44db61517ed7bc6b3ac08366a4ac5d' 
  AND token = 'EVty53ZFnlqk5+TN90EcbVZGGilR7vT71ZCtj6p/ve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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