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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ae28e326af3bf924d0ff32a4b44fa5ae1bee3990613aae5102884570ea57bc' 
  AND token = 'ehxc1eCBqInvlWmpV/1IU1wXyRXjMB9OVsGti4qvlS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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