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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28a8836d9c843a9df24a3e3d40f84572a8b632d0edd6d40113d2fbe6851f7b4' 
  AND token = 'LOP8ZM395OR5dgrgNvtdo799R7BuEd4FOdXjxDWPuTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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