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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28aeffe4e148743daac5b0cc4772a4e0d192a731555147044be1458b653cfa7c' 
  AND token = 'E9aVmlnu70Jks6mwx54nODc4H/UN7LXTTPVRp8RyVJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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