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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679917a2245e09b2ececdf4d63614d497011fb93a58d318083a2f99863430f1b' 
  AND token = '+0lbkk61q5f/Yaq/z2FAaSpsJDlp4iluibQOGLcziQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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