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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea236e246efd4a41af9cc42ce1f36d8e439cb99a9a6dece9abfdf6e9c5f6b2f' 
  AND token = 'pyBhK5JtSz2VFTdBgIltSOaCEj5Rzjn+JP2sA0KNwjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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