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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b789cff78fefd92a8fec2eadd3b7742e874ef6b760a108ba92dc5e22f254244' 
  AND token = 'm2XZBN1ny4gTpqgC1Nq9KfbvHnIyWhk8vSUWVvTttp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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