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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e2f46dfac0bb05e5d83ee2d7502f325ffe0846463783ba9bf31bde8c5e1bf3' 
  AND token = '4LQSHZaTDfcSxCstOc/J6SgmZbX6Uir0pqslkmaLsQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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