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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b2720d8eddc29b1b6e2ff852996486ed14d791d3e04e8b82c2ef43b23cd8e4' 
  AND token = 'toeZ5it+TGXu69xo0cQdDLr50jj7fTk8F1H+J5zKc4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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