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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcb811288e227e5c912c07d0e7bea9c4b9829355071659299a513bc05f1c9fa' 
  AND token = 'SEUp7ergrW0XuLTc2puO4QN+92utl1Uhh6wMvfbTgTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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