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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dd28e6072f6a248f3fc7e0692f05f6c3b38983337b597a36373c90f7ec04e2' 
  AND token = 'UdGmlU2yj5z0F8JOTrDUFSsiqTu0XyH//P50/XvqUvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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