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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9db8ce0806d454ed61712f32d7a13587c45c00f59817d960b004413fe7632b4' 
  AND token = 'nvQstqgUi9UPyn9bUH6TA+AX3yzfJwjxl5bc+xsgSkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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