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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac62ebd21ced62435e5d82d7990799f5bda506a9edc0c986d52131de666f433' 
  AND token = 'YjGMUQP0t9jTsyI0K/WqM0BdlUi3sNwEQXC7zfhCNZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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