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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5534f125e03676b04b4dd3103d00b8a9761e2efeb0c63740ed42894eb6cfb98d' 
  AND token = 'J/hhK3co7jomI27nRlLcJMvLcZEOjqbgxkmNpyViGds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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