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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b9bfb573e8832eba9cb11c90a12346a4f1d021c3902cc3957d8dc5691341ad' 
  AND token = 'dZ5An2dIhPCQHZgtOEsufOdC+eQVULtFDQM124LpniI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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