SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6499a320c5aff6e37b15684728981a72c05b65af936180bd29d68ee70c9b6cc8' 
  AND token = 'VhBupX2e38S8T9QF/j/5VAbPHWUYLkznJgztXYKsTBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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