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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd981591fe5825336f49bca41f3c6f5ca8724ee2e47f541296029398a82a827f9' 
  AND token = 'aLgiDq1XxUUok5Fu0cE13fj5qJ1dy6jLLU/wVwrUvUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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