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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cdf6f31ea8503e3fc2a9dbbdd3032e6547529f0544256dea4cc65ea2a924cb' 
  AND token = 'kglqwaaex8BdNuMq5/IVpVWPXKAADpBZepgpV5XJmeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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