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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cd30c55ae5600761d0ff7d6e0182693ead4cd2d7d6948b9ae500cb50be71e3' 
  AND token = 'vn6dNMb0dfB+oRWScE1E0otsTcEidyK+NimOoz7JEDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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