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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17be1ba5d8fb549b8db2933709be9cb47249d0eaa2cd0eaa8af98b075e7ec02c' 
  AND token = 'm8UHh7Ae6fhXsjyQu1NRBtZ6GEzfUY/bXAYQ0Dx7QjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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