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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd499095a393f6ec4bae38e87262e9bec6ce09207e8968e64373ca4abbabfd7' 
  AND token = 'HyHBDRUClVR7Ypn5y8/2lKZbOB619+tZ1K1oo3+QrFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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