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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f58f8b3d3c22bea7fbe9314239964580f301a08445837b4c992599ea36f75d3' 
  AND token = 'imjH182Js9iWXsWHwWo040h4xecoCb0Oj8pfbZpqdww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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