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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ae41781fa6a96c86d45f7df9fe258e2b11cb8bddcdb60e2d0ea59bc062262d' 
  AND token = 'WjHjSEJo4JXFL9qnc3yWgcDaRjW/IuD5hNYQOgKeXgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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