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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796f26b699e077811cdb2ef1cc798b693b1421ef9a9240d19913cbfb2f7ce944' 
  AND token = 'dk/MH327uiWhaKkLf5uTO7bvUpGLpF/qYBFRt9WBddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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