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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c425d23871177ec6a9a9134d7e9de70a61775b928b2ad0a92b32e5877dae43' 
  AND token = 'EUc/yOdNO/LbZza9KNceW+IqQbEIHQkuyWIFbP348eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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