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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108c36c4abf422560354ecd8c57e36303bda59f720863c9d55b9d7790b34e37e' 
  AND token = '5aI/70y0Prc65xd/T7HmzIFenZNvTk9jlBZiTXEz0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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