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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb607a3fe0b51212e2de02ae1ae61cb2c5cb23aa552319da0466a3dff69b655c' 
  AND token = 'l8xg4OPl4ei1dAM5cioBGHzcSCPwq/tNeIhUMYeDlmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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