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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99e16245c4f9bf2090a6a5ee1c92a74c4f3a2c23e5cd56fffbd0f9cfa2d55c9' 
  AND token = 'LDNfRu37m+tPFsUYUlqlox2DXlhj8giXYLJP7KtGtaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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