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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2633f0762e5497b969fc74fd5e5b7c543f3729ac43e2b1fa9bdc02afb800ff' 
  AND token = '6lvJnyuywWKBqIeC0aC326PBbUAyXPzwQXlTrG1TQdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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