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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35de4f91c5aa63f2763166298f8dbd653fc6732538627bf0bcd1a9696799e49e' 
  AND token = 'LbSz7Scj0T6Db3LyGEH7VHDrzTeo8zXZNxJtn6GC7jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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